CA1275258C - Underground clean-up machine - Google Patents
Underground clean-up machineInfo
- Publication number
- CA1275258C CA1275258C CA000575566A CA575566A CA1275258C CA 1275258 C CA1275258 C CA 1275258C CA 000575566 A CA000575566 A CA 000575566A CA 575566 A CA575566 A CA 575566A CA 1275258 C CA1275258 C CA 1275258C
- Authority
- CA
- Canada
- Prior art keywords
- vehicle
- motor
- hydraulic
- frame
- pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000012530 fluid Substances 0.000 claims abstract description 17
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- KUVIULQEHSCUHY-XYWKZLDCSA-N Beclometasone Chemical compound C1CC2=CC(=O)C=C[C@]2(C)[C@]2(Cl)[C@@H]1[C@@H]1C[C@H](C)[C@@](C(=O)COC(=O)CC)(OC(=O)CC)[C@@]1(C)C[C@@H]2O KUVIULQEHSCUHY-XYWKZLDCSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 101150008563 spir gene Proteins 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2253—Controlling the travelling speed of vehicles, e.g. adjusting travelling speed according to implement loads, control of hydrostatic transmission
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K3/00—Arrangement or mounting of steam or gaseous-pressure propulsion units
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Component Parts Of Construction Machinery (AREA)
Abstract
THE ABSTRACT OF THE DISCLOSURE
There is provided a new and useful motor vehicle comprising a frame, motive means for supporting the frame, a pneumatic motor mounted on the frame and having an inlet adapted to be connected to a pneumatic source and having an outlet for exhaust, an hydraulic system comprising an hydraulic pump mounted on the frame and connected to the motor to be driven thereby, an hydraulic motor mounted on the frame, and inlet and outlet lines to and from the pump and the motor for hydraulic fluid whereby the motor is connected to the pump to be driven thereby, and wherein the motor is connected to the motive means to drive the motive means.
There is provided a new and useful motor vehicle comprising a frame, motive means for supporting the frame, a pneumatic motor mounted on the frame and having an inlet adapted to be connected to a pneumatic source and having an outlet for exhaust, an hydraulic system comprising an hydraulic pump mounted on the frame and connected to the motor to be driven thereby, an hydraulic motor mounted on the frame, and inlet and outlet lines to and from the pump and the motor for hydraulic fluid whereby the motor is connected to the pump to be driven thereby, and wherein the motor is connected to the motive means to drive the motive means.
Description
~75~S~3 This application relates to a motor vehicle powered by a combination pneumatic and hydraulic drive system.
BACKGROUND OF THE INV~NTION
There has been a need in certain work environments for vehicles andJor machines which are not powered by combustion or the like engines. Depending on the particular environment in question, a variety of factors prevent the use of conventional equipment. This may include limited ventilation, limited environmental air supply and the like problems. A typical such environment is found in underground mines.
Furthermore, while particular types of machinery have been available for underground operations, these have been substantially limited in manoeuvrability and range of operations.
A great deal of work is thus left to be done by hand.
A typical example is in cleanup after mucking machine operations. This work is currently done by hand and thus attracts very high labour costs.
It is against that background that the present i~vention arises. A motor vehicle system has now been devised which combines pneumatic and hydraulic power to provide motive power for the vehicle itself and as well to power a work attachment on the vehicle. In the inven~ion an air motor driven by an available compressed air supply is utilized to drive an hydraulic pump. The hydraulic pump ln turn provides the '~''l~
' ' ', ' .:
.
~5~rj8 hydraulic pressure for a hydraulic motor to operate through a differential to clrive the vehicle and, as well, provides hydraulic pressure for the hydraulic assembly on a w~rk attachment such as a backhoe.
PRIOR ART
It is known to utili~e air motors to power such equipment as shovel loaders or mucking machines for use in underground mines. However, applicant is not aware of any use of such motors in combination with a hydraulic system such as that described and claimed in the present case.
The applicant is unaware of any patent documents relating to the invention.
BRI~F SUMMARY OF TH~ INV~NTION
The invention provides a motor vehicle comprising a frame; motive means for supporting the frame; a pneumatic motor mounted on the ~rame and having an inlet adapted to be connected to a pneumatic source and having an outlet for exhaust; an hydraulic system comprising an hydraulic pump mounted on the frame and connected to the motor to be driven thereby; an hydraulic motor mounted on the frame; and inlet and outlet lines to and from the pump and the motor for hydraulic fluid whereby the motor is connected to the pump to be driven thereby; and , .
.- : : . : . . -: : . - . .
:, 7S~
wherein the motor is connected to the motive means to drive the motive means.
In a further embodiment there .i5 provided an hydraulically powered work attachment driven by the hyclrauli.c pump.
In a further embodiment the invention provides heat exchange means for effecting heat exchange between higher temperature hydraulic fluid in the return line to the hydraulic pump and lower temperature exhaust from the pneumatic motor.
BRIEF D~SCRIPTIO~ OF TH~ DR~WI~GS
.
In drawings which illustrate embodiments of the invention:
FIGURE 1 is a schematic illustration of a vehicle according to the invention;
FIGURE 2 is a side view of a pneumatic motor and hydraulic pump assembly for use in the vehicle of FIGURE l;
FIGURE 3 is a front elevation of heat exchange means for use in the vehicle of FIGURE l;
FIGURE 4 is a side elevation of the heat exchange means f FIGURE 3;
FIGURE 5 is a xearview of the heat exchange means of FIGURE 3;
FIGURE 6 is a top plan view of the heat exchange means of FIGURE 3; and , - 3 -.
- . : - , . . , . ~ :
$~
FIGURE 7 is a sketch lllustrating the pneumatic and hydraulic flow paths in the vehicle according to the invention.
While the invention will be described in conjunction with illustrated embocl:iments, it will be understood that it is not intended to limit the invention to such embodimerlts. On the contrary, it is intended to cover all alternatives, modifications and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims.
DETAI~ED D~SCRIPTION OF ~H~ P~FERRED EMBODIM~TS
In the following description, similar features in the drawings have been given similar reference numerals~
The vehicle 10 includes a frame 12 mounted on wheels 14. While rubber tired wheels are illustrated, other motive means may be utilized where desirable. A conventional hydraulic backhoe arrangement 16 is mounted at one end of the fram~. A
swivelling operator's seat 18, controls 20 and steering wheel 22 are mounted in appropriate positions.
Mounted transversely on the frame 12 is a pneumatic or air motor 24 having an air inlet 26 and air exhau~t 28. The air inlet 26 is adapted to be connected to a compressed air source which would either be available or must be made available in the working environment.
The air motor 24 is connected via drive shafts 30 and 32 and coupling 34 to the oil pump 36.
' ' ' :
.
7S~
Also mounted on the :Erame 12 is an hydraulic motor 38 which is connectecl via drive shaft 40 and clutch assembly 42 to differential 44. These last three components may be of any conventional or su.itable design.
Also mounted on the frame 12 i5 a heat exchange unit 46. While various configurati.ons would be suitable for the unit 46, the preferred configuration, as illustrated, comprises in side by side arrangement a muffler 48 for the air exhaust from motor 24 and an oil cooling chamber 50 which comprises a reservoir for the hydraulic system. The air exits the motor at a very low temperature, and the hydraul.ic fluid having circulated through the system is at a substantially higher temperature prior to recirculation through the oil pump. Accordingly, the unit 46 serves both to warm the exhaust air to prevent freeze ups and to cool the hydraulic fluid to prevent overheating and resulting problems. FIGURES 3 to 6 illustrate a preferred configuration for the unit 46. With reference to the muffler side 48 of unit 46, the exhaust 28 from motor 24 is directed through two inlets 52 and 54. The muffler 48 preferably includes perforated baffles 56 and 58 through which the exhaust passes. The exhaust is then released into the surrounding environment through the outlet pipes 60 and 62.
The oil cooler 50 of the unit 46 includes an inlet 64 delivering hot hydraulic fluid from the motor 38 and the backhoe 16 and an outlet 66 delivering cooled hydraulic fluid to the oil pump 36. A make up iller cap 68 is provided for addition of .
. ~ , ~ - ' ' - - '.
5~
hydraulic fluid as necessary to the reservoir.
FIGURE 7 illust:rates schematically the manner in whlch the components are interconllect:ed by the pneumatic and hydraulic lines. Thus, compressed air from a supply enters motor 24 throuyh inlet 26 and exits through exhaust 28. Exhaust 28 leads to inlets 52 and 54 (the latter not shown in the sketch) and after passing through muffler A8 exits through outlet pipes 60 and 62 (the latter not shown in the schematic).
The hydraulic fluid is made available via the outlet 66 of the reservoir cooler unit 50 to hydraulic line 70 leading to oil pump 36. The fluid is then pumped by pump 36 through line 72 to a conventional hydraulic control valve 74. From the control valve hydraulic fluid is directed either through line 76 to motor 38 or through line 78 to the backhoe control panel 80. Control panel 80 is conventional. The hydraulic fluid is then delivered by return lines 82, 84 and 86 to the cooler reservoir unit 50.
In the preferred case the machine is designed to operate on available air pressure from 60 to 125 PSI.
Thus it is apparent that there has been provided in accordance with the invention a motor vehicle powered by a combination pneumatic and hydraulic drive system that ~ully satisfies the objects, aims and advantages set forth above.
While the invention has been described in conjunction with specific embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description.
'' '.
, - ., . ~ . . ..
~ ~ 7S~
Accordingly, it is intended to embrace all such alternatives, modifications and variati.ons as Eall within the spir:it and broad scope of the invention.
. . : . .
. . .
.
, . ,
BACKGROUND OF THE INV~NTION
There has been a need in certain work environments for vehicles andJor machines which are not powered by combustion or the like engines. Depending on the particular environment in question, a variety of factors prevent the use of conventional equipment. This may include limited ventilation, limited environmental air supply and the like problems. A typical such environment is found in underground mines.
Furthermore, while particular types of machinery have been available for underground operations, these have been substantially limited in manoeuvrability and range of operations.
A great deal of work is thus left to be done by hand.
A typical example is in cleanup after mucking machine operations. This work is currently done by hand and thus attracts very high labour costs.
It is against that background that the present i~vention arises. A motor vehicle system has now been devised which combines pneumatic and hydraulic power to provide motive power for the vehicle itself and as well to power a work attachment on the vehicle. In the inven~ion an air motor driven by an available compressed air supply is utilized to drive an hydraulic pump. The hydraulic pump ln turn provides the '~''l~
' ' ', ' .:
.
~5~rj8 hydraulic pressure for a hydraulic motor to operate through a differential to clrive the vehicle and, as well, provides hydraulic pressure for the hydraulic assembly on a w~rk attachment such as a backhoe.
PRIOR ART
It is known to utili~e air motors to power such equipment as shovel loaders or mucking machines for use in underground mines. However, applicant is not aware of any use of such motors in combination with a hydraulic system such as that described and claimed in the present case.
The applicant is unaware of any patent documents relating to the invention.
BRI~F SUMMARY OF TH~ INV~NTION
The invention provides a motor vehicle comprising a frame; motive means for supporting the frame; a pneumatic motor mounted on the ~rame and having an inlet adapted to be connected to a pneumatic source and having an outlet for exhaust; an hydraulic system comprising an hydraulic pump mounted on the frame and connected to the motor to be driven thereby; an hydraulic motor mounted on the frame; and inlet and outlet lines to and from the pump and the motor for hydraulic fluid whereby the motor is connected to the pump to be driven thereby; and , .
.- : : . : . . -: : . - . .
:, 7S~
wherein the motor is connected to the motive means to drive the motive means.
In a further embodiment there .i5 provided an hydraulically powered work attachment driven by the hyclrauli.c pump.
In a further embodiment the invention provides heat exchange means for effecting heat exchange between higher temperature hydraulic fluid in the return line to the hydraulic pump and lower temperature exhaust from the pneumatic motor.
BRIEF D~SCRIPTIO~ OF TH~ DR~WI~GS
.
In drawings which illustrate embodiments of the invention:
FIGURE 1 is a schematic illustration of a vehicle according to the invention;
FIGURE 2 is a side view of a pneumatic motor and hydraulic pump assembly for use in the vehicle of FIGURE l;
FIGURE 3 is a front elevation of heat exchange means for use in the vehicle of FIGURE l;
FIGURE 4 is a side elevation of the heat exchange means f FIGURE 3;
FIGURE 5 is a xearview of the heat exchange means of FIGURE 3;
FIGURE 6 is a top plan view of the heat exchange means of FIGURE 3; and , - 3 -.
- . : - , . . , . ~ :
$~
FIGURE 7 is a sketch lllustrating the pneumatic and hydraulic flow paths in the vehicle according to the invention.
While the invention will be described in conjunction with illustrated embocl:iments, it will be understood that it is not intended to limit the invention to such embodimerlts. On the contrary, it is intended to cover all alternatives, modifications and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims.
DETAI~ED D~SCRIPTION OF ~H~ P~FERRED EMBODIM~TS
In the following description, similar features in the drawings have been given similar reference numerals~
The vehicle 10 includes a frame 12 mounted on wheels 14. While rubber tired wheels are illustrated, other motive means may be utilized where desirable. A conventional hydraulic backhoe arrangement 16 is mounted at one end of the fram~. A
swivelling operator's seat 18, controls 20 and steering wheel 22 are mounted in appropriate positions.
Mounted transversely on the frame 12 is a pneumatic or air motor 24 having an air inlet 26 and air exhau~t 28. The air inlet 26 is adapted to be connected to a compressed air source which would either be available or must be made available in the working environment.
The air motor 24 is connected via drive shafts 30 and 32 and coupling 34 to the oil pump 36.
' ' ' :
.
7S~
Also mounted on the :Erame 12 is an hydraulic motor 38 which is connectecl via drive shaft 40 and clutch assembly 42 to differential 44. These last three components may be of any conventional or su.itable design.
Also mounted on the frame 12 i5 a heat exchange unit 46. While various configurati.ons would be suitable for the unit 46, the preferred configuration, as illustrated, comprises in side by side arrangement a muffler 48 for the air exhaust from motor 24 and an oil cooling chamber 50 which comprises a reservoir for the hydraulic system. The air exits the motor at a very low temperature, and the hydraul.ic fluid having circulated through the system is at a substantially higher temperature prior to recirculation through the oil pump. Accordingly, the unit 46 serves both to warm the exhaust air to prevent freeze ups and to cool the hydraulic fluid to prevent overheating and resulting problems. FIGURES 3 to 6 illustrate a preferred configuration for the unit 46. With reference to the muffler side 48 of unit 46, the exhaust 28 from motor 24 is directed through two inlets 52 and 54. The muffler 48 preferably includes perforated baffles 56 and 58 through which the exhaust passes. The exhaust is then released into the surrounding environment through the outlet pipes 60 and 62.
The oil cooler 50 of the unit 46 includes an inlet 64 delivering hot hydraulic fluid from the motor 38 and the backhoe 16 and an outlet 66 delivering cooled hydraulic fluid to the oil pump 36. A make up iller cap 68 is provided for addition of .
. ~ , ~ - ' ' - - '.
5~
hydraulic fluid as necessary to the reservoir.
FIGURE 7 illust:rates schematically the manner in whlch the components are interconllect:ed by the pneumatic and hydraulic lines. Thus, compressed air from a supply enters motor 24 throuyh inlet 26 and exits through exhaust 28. Exhaust 28 leads to inlets 52 and 54 (the latter not shown in the sketch) and after passing through muffler A8 exits through outlet pipes 60 and 62 (the latter not shown in the schematic).
The hydraulic fluid is made available via the outlet 66 of the reservoir cooler unit 50 to hydraulic line 70 leading to oil pump 36. The fluid is then pumped by pump 36 through line 72 to a conventional hydraulic control valve 74. From the control valve hydraulic fluid is directed either through line 76 to motor 38 or through line 78 to the backhoe control panel 80. Control panel 80 is conventional. The hydraulic fluid is then delivered by return lines 82, 84 and 86 to the cooler reservoir unit 50.
In the preferred case the machine is designed to operate on available air pressure from 60 to 125 PSI.
Thus it is apparent that there has been provided in accordance with the invention a motor vehicle powered by a combination pneumatic and hydraulic drive system that ~ully satisfies the objects, aims and advantages set forth above.
While the invention has been described in conjunction with specific embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description.
'' '.
, - ., . ~ . . ..
~ ~ 7S~
Accordingly, it is intended to embrace all such alternatives, modifications and variati.ons as Eall within the spir:it and broad scope of the invention.
. . : . .
. . .
.
, . ,
Claims (10)
1. A motor vehicle for use in underground operation and comprising:
a frame;
motive means for supporting said frame;
a pneumatic motor mounted on said frame and having an inlet, and having an outlet for exhaust; said inlet adapted to be connected to a source of compressed air continuously during operation of said vehicle;
an hydraulic system comprising an hydraulic pump mounted an said frame and connected to said pneumatic motor to be driven thereby; an hydraulic motor mounted on said frame; and inlet and outlet lines to and from said pump and said hydraulic motor for hydraulic fluid whereby said motor is connected to said pump to be driven thereby; and wherein said hydraulic motor is connected to said motive means to drive said motive means.
a frame;
motive means for supporting said frame;
a pneumatic motor mounted on said frame and having an inlet, and having an outlet for exhaust; said inlet adapted to be connected to a source of compressed air continuously during operation of said vehicle;
an hydraulic system comprising an hydraulic pump mounted an said frame and connected to said pneumatic motor to be driven thereby; an hydraulic motor mounted on said frame; and inlet and outlet lines to and from said pump and said hydraulic motor for hydraulic fluid whereby said motor is connected to said pump to be driven thereby; and wherein said hydraulic motor is connected to said motive means to drive said motive means.
2. The vehicle of claim 1 wherein said vehicle includes an hydraulically powered work attachment driven by said pump.
3. The vehicle of claim 1 wherein said pneumatic motor includes an exhaust line and said vehicle includes heat exchange means for heat exchange between pneumatic motor exhaust and hydraulic fluid in said hydraulic system.
4. The vehicle of claim 3 wherein said heat exchange means comprises a heat exchanger having a first compartment through which pneumatic motor exhaust passes and a second compartment through which hydraulic fluid passes, said first and second compartments being in heat transfer relationship.
5. The vehicle of claim 4 wherein said first compartment comprises a muffler for the pneumatic motor exhaust.
6. The vehicle of claim 4 wherein said second compartment comprises a hydraulic fluid reservoir.
7. The vehicle of claim 4 wherein said heat exchange means is interposed in said hydraulic system prior to entry of said hydraulic fluid into said pump.
8. The vehicle of claim 1 wherein said motive means comprises a set of wheels.
9. The vehicle of claim 1 further comprising a work attachment mounted on said frame and wherein said work attachment is hydraulically powered by said hydraulic system.
10. The vehicle of claim 9 wherein said work attachment is a backhoe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000575566A CA1275258C (en) | 1988-08-24 | 1988-08-24 | Underground clean-up machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000575566A CA1275258C (en) | 1988-08-24 | 1988-08-24 | Underground clean-up machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1275258C true CA1275258C (en) | 1990-10-16 |
Family
ID=4138602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000575566A Expired - Lifetime CA1275258C (en) | 1988-08-24 | 1988-08-24 | Underground clean-up machine |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1275258C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102673362A (en) * | 2012-05-12 | 2012-09-19 | 张庆春 | High-pressure air energy vehicle |
-
1988
- 1988-08-24 CA CA000575566A patent/CA1275258C/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102673362A (en) * | 2012-05-12 | 2012-09-19 | 张庆春 | High-pressure air energy vehicle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1058775B1 (en) | Cooling and heating system | |
| US4352455A (en) | Arrangement for heating the service cabin of a machine driven by an internal combustion engine | |
| US4069972A (en) | Heat systems for vehicles | |
| US20080108032A1 (en) | Radial venting axial fan for a power machine | |
| RU2138655C1 (en) | Drive unit with motor and retarder | |
| CN204628525U (en) | For cooling system and the machine of machine | |
| US20050166587A1 (en) | Independent metering valve assembly for multiple hydraulic load functions | |
| CA2070013A1 (en) | Variable speed hydraulic pump system for liquid trailer | |
| JP2001016827A (en) | Construction machine | |
| SE8105223L (en) | DEVICE FOR HEATING CABINETS FOR TOOLS OR VEHICLES | |
| US6135065A (en) | Cooling system for a machine | |
| CA1275258C (en) | Underground clean-up machine | |
| US20070227135A1 (en) | Integrated load-sensing hydraulic system | |
| EP1118720B1 (en) | Hydraulic working machine | |
| EP0619857B1 (en) | Intercooler apparatus | |
| US6463893B1 (en) | Cooling fan drive system | |
| JP2005539169A (en) | Cooling device for vehicle and vehicle including the cooling device | |
| GB1064735A (en) | Apparatus for cutting holes in a body such as a sewer main | |
| CN215944238U (en) | Cab air conditioning system of rotary forklift truck and rotary forklift truck | |
| US4624333A (en) | Method and apparatus for startup of a hydrostatic transmission | |
| CN205025785U (en) | Drive arrangement , hydraulic drive cooling system and operation machinery of radiator fan | |
| BR102015010274B1 (en) | HYDRAULIC FLUID SUPPLY SYSTEM | |
| EP1080619A3 (en) | Automobile agricultural working vehicle | |
| US4325452A (en) | Work vehicle | |
| US4475332A (en) | Manually operable variable bleed for hydrostatic transmission |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |